fix: handle nil headers

backend/controller/ingress/response.go

@@ -53,6 +53,9 @@ func ResponseForVerb(sch *schema.Schema, verb *schema.Verb, response HTTPRespons
 
 	// Clone and canonicalise the headers.
 	headers := http.Header(maps.Clone(response.Headers))
+	if headers == nil {
+		headers = http.Header{}
+	}
 	for k, v := range response.Headers {
 		headers[http.CanonicalHeaderKey(k)] = v
 	}

backend/schema/validate.go

@@ -8,7 +8,6 @@ import (
 	"strings"
 
 	"github.com/alecthomas/participle/v2"
-	"github.com/alecthomas/repr"
 	"golang.design/x/reflect"
 	"golang.org/x/exp/maps"
 
@@ -218,8 +217,6 @@ func ValidateModule(module *Module) error {
 					if n.Module == "" {
 						merr = append(merr, fmt.Errorf("%s: unqualified reference to invalid data structure %q", n.Pos, n))
 					}
-					repr.Println(n)
-					repr.Println(mdecl)
 					n.Module = mdecl.Module.Name
 				}
 			} else if n.Module == "" || n.Module == module.Name { // Don't report errors for external modules.

go-runtime/compile/schema_test.go

@@ -1,7 +1,6 @@
 package compile
 
 import (
-	"fmt"
 	"go/ast"
 	"go/types"
 	"strings"
@@ -47,7 +46,6 @@ func TestExtractModuleSchema(t *testing.T) {
 
 func TestExtractModuleSchemaTwo(t *testing.T) {
 	_, actual, err := ExtractModuleSchema("testdata/two")
-	fmt.Println(actual)
 	assert.NoError(t, err)
 	actual = schema.Normalise(actual)
 	expected := `module two {

go-runtime/encoding/encoding.go

@@ -11,8 +11,6 @@ import (
 	"reflect"
 	"strings"
 
-	"github.com/alecthomas/repr"
-
 	"github.com/TBD54566975/ftl/backend/schema/strcase"
 )
 
@@ -121,7 +119,6 @@ func encodeStruct(v reflect.Value, w *bytes.Buffer) error {
 			(t.String() == "ftl.Unit" && fv.IsZero()) ||
 			(strings.HasPrefix(t.String(), "ftl.Option[") && fv.IsZero()) ||
 			(t == reflect.TypeOf((*any)(nil)).Elem() && fv.IsZero()) {
-			repr.Println(ft.Name, fv.Interface())
 			continue
 		}
 		if afterFirst {